Brake



July 5 1927.

. w 1,635,021 W. S. ADAMS BRAKE Filed Ju y 1925 2 Sheets-Sheet. 1

Z k; arj a w. s. ADAMS r BRAK E 2 Sheets-Sheet 2 Filed July 5. 1925 Patented July 5, 1927. i A H i UNITED sfraras ee'isn'r orsice.

WALTER S. ADAMS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE J. G. BRILL COMPANY, OF PHILADELPHIA, FENNSYLVANIA, -A CORPORATION OF PENNSYL- VANIA. v V

' BRAKE.

A ueatm filed an 3, 1925. Serial No. 41, 88.

This invention relates'to a brake mechapreferably somewhat flexible at their cennism which is particularly applicable to the tlal portions andareprovided at .or near trucks of railway-cars, but it will be under-- their ends with brackets 9 and 9 "and stood that the invention is not necessarily 10 and 10". Renewable linings 9 and 10 5 so limited. In accordance with the invenare provided.

tion two separate brake shoes are provided 'F or supporting and controlling the brake for c o-eperating with the brake drum and shoes there are provided two operating levthe principal object of the invention is to ers l1 and 12 which are mounted for moveprovide a simple and effective mechanism ment about oppositely disposed fixed pivots 10 for applying pressure to both endsof both :13 and 14. The two pivots l3 andl are brake shoes so as to secure the maximum preferably located midwaybetween the two braking action. Further objects of the inbrake shoes and are preferably a-t'the'same ventionwill be apparent from the following level ,as the axis of the axle 2, the shoes 9 specification and-claims. I and 10 being respectively above and below 15 In [the [accompanying drawings I have the axle. The two pivots l3 and 14 may be shown the embodiment of the invention mounted in different ways butI prefer and which I now ,oleem preferable but it will have shown these pivots *as carried by arms be understood that the drawings are for 15 and 16 projecting horizontally from the illustrative purposes onlyand that various bearing box 3' and preferably formed inte- .20 changes and substitutions may be made grally therewith,

within the scope of the claims without de- The two levers 11 and 12 compriseporarting from 'the'spirit of .the invention. tions 'll and 12? which are directly sup- Of the drawings: I a ported on the respective pivots 13 and 1e and Fig. l is a plan View of a'portion of a also comprise upward extending portions 26 railway truck having a brake mechanism 11 and 12 which are-at angles to thefirst embodying the invention. p c r v c said portions l1 and 12 The two portions as Fig. 2 is'a side'view ofthat part of the, 11 and 12 are parallel and approximately truck shown in-Fig. l. horizontal although theymay be slightly in- Fig. 3 is an enlarged view of the brake clined as shown. The two portions 11 and 3e mechanism, this view being partly lnsec- 12 are connected together by means oft a lion along the line 3+8 of'Fig. 1. "link 1?. Provision is" made "for operating Figs. 4 to 9 show det ail oi the mecha- "the two levers in unison, this means being nism as illustrated in Fig; 3. shown as a link 18 connected with or form- R ferring to the drawings, 'l'zre'pres'ents 'ing a part of the link 17. 35 onefof the truck wheels and Qthea-Xle' to j For controlling the engagement between which the .wheel is seciired. The axle 2 the respective shoes 9 and 10 and the drum we '.is provided withabearing be 8, The 8,1 provide two pairs of links 19' and 20 frame .of the truck is represented at 4 and' and 21 and-22. "The twoflinks l9 and'QO this frame is supported on thebearing box are connected with the respective lever por- 40 3. There'a-re several well known types oi 'tions 11 and 12 at one side, in this case construction for supporting .the frame on 'the righ t side, er the respective pivots 13 the box, aud tor purposes of illustration I and :14. The other ends of these links'are have shown a semi-elliptic spring 5" which connected with theafores'aidbrackets 9- and is secured to the bearing box 3 by'fmea-ns" of' 9P projecting from the brake shoe 9. Sim- 45 bolts ,6, 6 and which is conne'ctedwith the ilarl-y'the links 21and 22 are'pivotal'ly confranleiby.meansoofshackle pins am, 7Q :"It nectedwith the portions and 12 of the will be observed that the spring 5 not onlyv levers at the otherside, in this case the left serves to transmit theweight of thefraine side, of the respective pivot pins 13 and l .to the bearing box but'also serves to prevent 14;. i The other ends of the links are piv- 50 the bearing box from rotating. otally connected with the aforesaid brackets Secured to the axle 2, preferably near th 710 and 10 projecting from the brake shoe frame 4:, is a brake drum 8 and two brake l0. s shoes Q'and 10 are rovided forco-operative The links 19, Q0, Q1 and 22 are similar engagement with t e drum. The shoes are in construction and mounting and a detailed ill description of one of them will suflice for all. Each of the links has at its outer end a hall and socket connection with the corresponding brake shoe bracket. This enables the brake shoe to acconn'nodate itself to any equalities in the i'nechanism or in the brake shoe lining. l lach oi the brake shoe brackets is provided with a hemispherical ment 2?). and as shown the end thereof is made square at 26. The adpistment in length is secured by turning the male member and in order to lock the two parts after adiustment the nicn'iber 24L is split ad jacent the threads and a bolt 27 extends transversely through two cars projecting from the two split portions. By drawing these ears together the bolt 2T serves to clamp the member and thus prevent any rotation thereof.

In order to hold the ball element 9.3 in engagement with the socket. I provide a coil spring 28 which extends between the member 24: and the corresponding brake shoe bracket. As shown the spring 28 is seated in annular recesses formed resl'iectivel in the member 2% and in the corresponding brake shoe bracket.

It is believed that the operation of the brake mechanism will be apparent from the foregoing description. Movement of the link l8 toward the right as shown in Fig. 23 will turn the levers 11 and 12 in the clockwise direction. This movement of the lovers will draw the links it) and 20 downward and the links it and 22 upward thus forcing the shoes and against the brake drum. inasmuch as pressure is applied to the shoes near the ends and inasmuch as the shoes are sli 'htly flexible at their central portions, the pressure causes them to wrap around the drum and to etl'ectively ei'igrag'e it througrln out their entire lengths. Movement of the link 18 toward the left will reverse the action which. has been described and will release the brake shoes.

it will be clear that the two brake shoes may be caused to exert equal pressure by properly adjusting; the links of the respective links 19 and 20 or ill and Q2.

The links may also be adjusted in length to compensate for the wear of the brake linings.

lVhat I claim is:

l. The combination in a brake mechanism of a rotatable brake drum. two operatim levers respectively mounted tor UHH QITIGlIt about two lined axes at o u'iositc sides oi" the axis of the drum, means for moving; the two levers in unison, two brake shoes adapted to engage the drum at opposite sides thereof and midway between the two pivotal axes, a pair of links having hall-andsocket connections with the respective ends of one shoe and also having pivotal connections with the respective o ierating levers at the same sides oi the pivotal axes thereof. and a second pair of links having ball-andsocket connections with the res 'iective ends of the other shoe and also having pivotal conned tions and the respective operating levers at; the same sides of the pivotal axes thereol and opposite to the points of connection of the first said links, each of the said links comprising male and female members threaded together with a ball element formed on the male member and with the said male member provided with a projection beyond the ball element whereby the said member may be turned.

2. The combination in a brake mechanism of a rotatable brake drum, two operating levers respectively mounted for movement about two fixed axes at opposite sides of the axis of the drum, means for movingthe two levers in unison, two brake, shoes adapted to engage the drum at opposite sides thereof and midway between the two pivotal axes, a pair of links having balland-socket connections with the respective ends of one shoe and also having pivotal connections with the respective. operating levers at the same sides ot the pivotal axes thereof, a second pair of links having; halls and-socket connections with the respective ends of the other shoe :mdualso ha vine pivotalconncctions with the respective o lieratinn levers at the same sides of the pivota axes thereof and opposite to the points of connection of the lirst said links. each ol the said links comprising male and l'cmale members threaded together with a hall element termed on the male member. and s 'irings interposed between the Female nicml'icrs ol? the respective links and the ends of the corresponding brake shoes for holding: the halland-socket connections in engagement.

\VALTER ADAM-S.

Ill) 

